In message <201002102002.40279.jorge.fabre...@gmail.com>, Jorge =?iso-8859-1?q? F=E1bregas?= writes: > Hello everyone, > > Today I had an issue with one of our caching nameservers (it wasn't presentin > g > a recently created MX record). I didn't know whether the server had any > problem requesting this record upstream or someone queried for this record > before it was created causing the server to cache the 'negative' result. I > presumed it was the latter and proceeded to manually flush the particular > domain. After that it worked. > > But... I'm wondering: Is there a way (using dig or rndc) to list the > "negative" records the server has in its cache? I guess I could dump the cach > e > contents and see it there (haven't tried it) but was wondering if there's a > proper way to do this (instead of just presuming "the server cached the > negative answer..."). > > Best regards, > Jorge > _______________________________________________ > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users
You can see a cached negative response by looking at the TTL of the SOA record. When that hits zero the cached negative response will be removed. See RFC 2308. ; <<>> DiG 9.3.6-P1 <<>> type100 isc.org ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27586 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;isc.org. IN UINFO ;; AUTHORITY SECTION: isc.org. 2209 IN SOA ns-int.isc.org. hostmaster.isc.org. 2010020700 7200 3600 24796800 3600 ;; Query time: 250 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Thu Feb 11 11:10:48 2010 ;; MSG SIZE rcvd: 79 ; <<>> DiG 9.3.6-P1 <<>> type100 isc.org ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31619 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; QUESTION SECTION: ;isc.org. IN UINFO ;; AUTHORITY SECTION: isc.org. 2203 IN SOA ns-int.isc.org. hostmaster.isc.org. 2010020700 7200 3600 24796800 3600 ;; Query time: 11 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Thu Feb 11 11:10:54 2010 ;; MSG SIZE rcvd: 79 -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
